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The Singular Behavior of the Lattice Hardness of Bismuth Cuprates Under Thermocycling

Published online by Cambridge University Press:  26 February 2011

V.N. Belomestnykh ,
O.L. Khasanov ,
Yu.P. Pokholkov  and
A.A. Bush
V.N. Belomestnykh
Affiliation:
Polytechnical Institute, Lenin Av. 30, Tomsk, 634050, USSR
O.L. Khasanov
Affiliation:
Polytechnical Institute, Lenin Av. 30, Tomsk, 634050, USSR
Yu.P. Pokholkov
Affiliation:
Polytechnical Institute, Lenin Av. 30, Tomsk, 634050, USSR
A.A. Bush
Affiliation:
Institute of Radio Engineering, Electronics and Automation, Vernadsky Av. 78, Moscow, 117454, USSR
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Abstract

Temperature depepdences of ultrasound velocity V and sound attenuation Q−1,the unit cell parameters a, b, c, and volume W were studied between 77 and 800 K for bismuth cuprates like Bi2Sr2Can−1 CUnO2n+2+8 with n = 1,2,3 (phases: 2201, 2212, and 2223). Acoustic spectra of textured and isotropic samples show anomalies (bending points,extrema, breaks, and splitting of resonance frequency) which are considered as a result of thermostimulated processes - phase transitions of I and II kinds, emergence of substructures in the cuprate lattices - in a system of solid solutions of the mentioned phases. Mechanical properties of the studied systems are observed to be very sensitive to a thermal prehistory (temperature and time ranges of thermocycling).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 226: Symposium H – Mechanical Behavior of Materials and Structures in Microelectronics , 1991 , 375
Copyright
Copyright © Materials Research Society 1991

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References

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